What is the idea Chaucer wishes to convey in "The Nonnes Preestes Tale"?

Chaucer is very often direct in the pronouncement of his
objectives and what he wishes to convey. This directness holds true for "The Nonnes
Preestes Tale." First, Chauntecleer expresses Chaucer's message. At the end of the tale,
Chauntecleer says that he can only be tricked once because God doesn't take kindly to
individuals who willfully get duped by evil doers. In other words, once may be an
accident, but twice is intention. Chauntecleer also makes it clear that flattery is a
device of evil doers to trick a good individual into ruin.

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[Chauntecleer]:
"I
shrewe myself bothe blood and bones,
If thou bigyle me ofter than
ones.
Thou shalt namoore, thurgh thy flaterye,
Do me to synge and
wynke with myn eye;
665    For he that wynketh whan he sholde
see,
Al wilfully, God lat him nevere
thee."

The Fox confirms this
in a sort of backward way. He says that God is pushed back by and calamity occurs to
those who fail to rightly govern their behavior:

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God yeve hym meschaunce,
That is so
undiscreet of governaunce

In
the end, the nun's priest redirects the focus slightly when he expresses Chaucer's
objective and message as being that the tale is meant to lead listeners to being good
and moral individuals. This redirection of focus does not contradict but gives broader
definition to what Chauntecleer and the Fox said.

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674    Taketh the moralite, goode
men;
[...]
Taketh the fruyt, and lat the chaf be
stille.
Now goode God, if that it be thy wille,
... make us alle
goode men,
680    And brynge us to his heighe blisse
....